diff --git a/du4/program.c b/du4/program.c
index f174d6d..1b27d7d 100644
--- a/du4/program.c
+++ b/du4/program.c
@@ -60,10 +60,11 @@ int main()
     	double first =-5,second =-5,res=-5;
     	char c='E';
       	char ravno[3];
+      	ravno[1]='\n';
     	sscanf(new_str,"%lf%c%lf%s%lf",&first,&c,&second,ravno,&res);
     
     
-    	if(c=='E'||first==-5||second==-5||res==-5||(c!=43&&c!=42&&c!=45&&c!=47||(strlen(ravno)!=1||ravno[0]!='='))){
+    	if(c=='E'||first==-5||second==-5||res==-5||(c!=43&&c!=42&&c!=45&&c!=47)||(ravno[1]!='\n'||ravno[0]!='=')){
     	    printf("CHYBA\n");
           	continue;
     	}